ARM: Fix Versatile&Integrator includes to behave in the same way as Realview

Realview doesn't include mach/platform.h in mach/hardware.h, so
make versatile behave in the same way.  Also, move the definition
of __io_address() into mach/hardware.h, just like Realview.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/mach-integrator/leds.c b/arch/arm/mach-integrator/leds.c
index 8dcc823..28be186 100644
--- a/arch/arm/mach-integrator/leds.c
+++ b/arch/arm/mach-integrator/leds.c
@@ -27,6 +27,7 @@
 #include <linux/io.h>
 
 #include <mach/hardware.h>
+#include <mach/platform.h>
 #include <asm/leds.h>
 #include <asm/system.h>
 #include <asm/mach-types.h>